FIELD: engines and pumps.
SUBSTANCE: adjustment method of a radial gap in a turbine of a double-flow gas turbine engine involves cooling of a rotor by high pressure air taken from a compressor and of a stator by air of the second circuit. Turbine stator cooling involves some part of air flow rate of the second circuit, which is taken using an air intake, and cooling air velocity in a turbine stator cooling circuit is increased. The radial gap is measured, and depending on its value the cooling air flow rate for turbine stator cooling is changed. The used air is discharged to the second circuit or after the turbine. The double-flow gas turbine engine includes a compressor, a combustion chamber and a cooled turbine. The turbine stator is made so that it is cooled by air of the second circuit. The supply system of stator cooling air is made in the form of an air intake installed in the second circuit and a flow control with a drive, as well as it includes an onboard computer and radial gap measurement sensors. Flow control drive and radial gap measurement sensors are connected through electrical connections to the onboard computer.
EFFECT: achieving effective control of radial gaps in a turbine in all modes; increasing engine thrust in takeoff and boost modes; improving efficiency and reliability of a turbine.
4 cl, 15 dwg
